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"At SEA, as well as ashore, watches and clocks are
normally set to some form of zone time (ZT). At SEA the
nearest meridian exactly divisible by 15° is usually used as
the time meridian or zone meridian.
Thus, within a time zone extending 7.5° on each side of the time meridian the time is the same, and time in consecutive zones differs by exactly one hour. The time is changed as convenient, usually at a whole hour, when crossing the boundary between zones.
Each time zone is identified by the number of times the longitude of its zone meridian is divisible by 15, positive in west longitude and negative in east longitude."
CHAPTER 18 - TIME
BOWDITCH
THE AMERICAN PRACTICAL NAVIGATOR
normally set to some form of zone time (ZT). At SEA the
nearest meridian exactly divisible by 15° is usually used as
the time meridian or zone meridian.
Thus, within a time zone extending 7.5° on each side of the time meridian the time is the same, and time in consecutive zones differs by exactly one hour. The time is changed as convenient, usually at a whole hour, when crossing the boundary between zones.
Each time zone is identified by the number of times the longitude of its zone meridian is divisible by 15, positive in west longitude and negative in east longitude."
CHAPTER 18 - TIME
BOWDITCH
THE AMERICAN PRACTICAL NAVIGATOR
Leia uma explicação para esta série de 30 posts clicando aqui
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